# 📐  L2 Digital Twin — Morphogen-Field Control Twin

**ID:** `L2-904` · **Status:** ⊙ Testnet (genesis catalog)
**Parents:** ⬆ Principle [`L1-904`](/artifact/l1/L1-904)

> **🎯 Tolerance (ε):** expression
> **⚖ Difficulty score:** 0.9 · **Delta tier:** 50

---

## 1. Domain Ω

**Type:** `range`

| Parameter | Unit | Range |
|---|---|---|
| Tissue | — | limb|cardiac|dermal |
| Timing hpa | — | 0 – 72 |
| Morphogen input | — | 0.0 – 1.0 |

## 2. Tolerance (ε)

**Type:** `fn`

```
≤ 8% error on restored functional fraction; pattern fidelity preserved
```

## 3. Difficulty

| Property | Value |
|---|---|
| Difficulty score | 0.9 |
| Delta tier | 50 |

## 4. Fingerprint

`03d04c59fcaf05fb3f1e87570cad751e93cb3ab3cb5dff6a096fefa789c556cf`

---

## File Mapping

This bundle consists of: `L2-904.md`, `L2-904.json`.

| File | Role | How to regenerate |
|------|------|-------------------|
| `L2-904.md` | Source of truth — edit this | Human or LLM |
| `L2-904.json` | Structured metadata for the registry | LLM regenerates from the sections above |

**Prompt for your LLM after editing this Markdown:**

> Read the attached Markdown. Regenerate the sibling `.json` so every field matches.
> Preserve the schema documented in the rows above.
> Output each file in its own fenced code block tagged with the filename.
> Output only the JSON object.

_This Markdown was auto-synthesized from the catalog row for `L2-904`._
_Edit it, regenerate the JSON, and submit at [/submit](/submit) to claim the artifact._